Mechanical thermostat



FIG. 1 is a perspective view of the present mechanical thermostat design;

FIG. 2 is a front view of the present mechanical thermostat design;

FIG. 3 is a right side view of the present mechanical thermostat design;

FIG. 4 is a left side view of the present mechanical thermostat design;

FIG. 5 is a top view of the present mechanical thermostat design;

FIG. 6 is a bottom view of the present mechanical thermostat design; and,

FIG. 7 is a rear view of the present mechanical thermostat design. 

The ornamental design for a mechanical thermostat, as shown. 